O Holy Night

18 December, 2014 at 18:30 | Posted in Varia | Leave a comment

 

Jussi — still no. 1!

Peace on Earth

18 December, 2014 at 18:21 | Posted in Varia | 1 Comment

 

The true meaning of econometric ‘unbiasedness’

18 December, 2014 at 16:32 | Posted in Statistics & Econometrics | Leave a comment

One should not jump to the conclusion that there is necessarily a substantive difference between drawing inferences from experimental as opposed to nonexperimental data …

In the experimental setting, the fertilizer treatment is “randomly” assigned to plots of land, whereas in the other case nature did the assignment … “Random” does not mean adequately mixed in every sample. It only means that on the average, the fertilizer treatments are adequately mixed …

abRandomization implies that the least squares estimator is “unbiased,” but that definitely does not mean that for each sample the estimate is correct. Sometimes the estimate is too high, sometimes too low …

In particular, it is possible for the randomization to lead to exactly the same allocation as the nonrandom assignment … Many econometricians would insist that there is a difference, because the randomized experiment generates “unbiased” estimates. But all this means is that, if this particular experiment yields a gross overestimate, some other experiment yields a gross underestimate.

Ed Leamer

Kindleberger and the Minsky model

18 December, 2014 at 11:25 | Posted in Economics | Leave a comment

In an often cynical world, standard financial and macroeconomic quantitative models give people the benefi t of the doubt. Fundamental economic theory assumes the best of us, supposing that human beings are perfectly rational, know all the facts of a given situation, understand the risks, and optimize our behavior and portfolios accordingly. Reality, of course, is quite different. While a significant portion of individual and market behavior can be modeled reasonably well, the human emotions that drive cycles of fear and greed are not predictable and can often defy historical precedent. As a result, quantitative models sometimes fail to anticipate major macroeconomic turning points. The ongoing debt crisis in Europe is the most recent example of an extreme event shattering historical norms.

kindleOnce an extreme event occurs, standard models offer limited insight as to how the ensuing crisis could play out and how it should be managed, which is why policy responses can seem disjointed. The latest policy responses to the European crisis have been no exception. To understand and respond to a crisis like the one in Europe, perhaps we need to consider some new models that include the “human factor.” Economic historian Charles Kindleberger can offer some insight. In his book Manias, Panics, and Crashes, Kindleberger explores the anatomy of a typical financial crisis and provides a framework that considers the impact of the powerful human dynamics of fear and greed. Kindleberger’s descriptive process of the boom and bust liquidity cycle can help shed light on the current European sovereign debt saga, and perhaps illuminate whether we have in fact turned the corner on this financial crisis.

Kindleberger analyzed hundreds of financial crises dating back centuries and found them to share a common sequence of events, one that followed monetary theorist Hyman Minsky’s model of the instability of a credit system. Fundamentally, the more stable and prosperous an economic structure appears, the more leverage and speculative financing will build within the system, eventually making it highly vulnerable to a surprising, extreme collapse. Kindleberger provided the qualitative (as opposed to quantitative!) description of the Minsky Model, shown below, which is a useful snapshot of the liquidity cycle. It can be applied to Europe and any potential boom/bust candidate, including Chinese real estate, commodity prices, or investors’ recent love affair with emerging markets. Kindleberger famously dubbed this sequence a “hardy perennial,” probably because the galvanizing human conditions of fear and greed are more often than not prone to overshoot fundamental values compared to the behavior of a rational individual, which exists only in macroeconomic theory.

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Loomis Sayles

hymanFor more on Minsky, listen to BBC 4 where Duncan Weldon tries to explain in what way Hyman Minsky’s thoughts on banking and finance offer a radical challenge to mainstream economic theory.

As a young research stipendiate in the U.S. thirty years ago, yours truly had the great pleasure and privelege of having Hyman Minsky as teacher. He was a great inspiration at the time. He still is.

Austerity kills

18 December, 2014 at 10:19 | Posted in Economics, Politics & Society | Leave a comment

The correlation between unemployment and suicide has been observed since the 19th century. People looking for work are about twice as likely to end their lives as those who have jobs.

In the United States, the suicide rate, which had slowly risen since 2000, jumped during and after the 2007-9 recession. In a new book, we estimate that 4,750 “excess” suicides — that is, deaths above what pre-existing trends would predict — occurred from 2007 to 2010. Rates of such suicides were significantly greater in the states that experienced the greatest job losses. Deaths from suicide overtook deaths from car crashes in 2009.

passport_The-Body-Economic-Why-Austerity-Kills-154521-ff93369df63aab983003If suicides were an unavoidable consequence of economic downturns, this would just be another story about the human toll of the Great Recession. But it isn’t so. Countries that slashed health and social protection budgets, like Greece, Italy and Spain, have seen starkly worse health outcomes than nations like Germany, Iceland and Sweden, which maintained their social safety nets and opted for stimulus over austerity. (Germany preaches the virtues of austerity — for others.) …

Our research suggests that investing $1 in public health programs can yield as much as $3 in economic growth. Public health investment not only saves lives in a recession, but can help spur economic recovery. These findings suggest that three principles should guide responses to economic crises.

First, do no harm: if austerity were tested like a medication in a clinical trial, it would have been stopped long ago, given its deadly side effects. Each nation should establish a nonpartisan, independent Office of Health Responsibility, staffed by epidemiologists and economists, to evaluate the health effects of fiscal and monetary policies.

Second, treat joblessness like the pandemic it is. Unemployment is a leading cause of depression, anxiety, alcoholism and suicidal thinking. Politicians in Finland and Sweden helped prevent depression and suicides during recessions by investing in “active labor-market programs” that targeted the newly unemployed and helped them find jobs quickly, with net economic benefits.

Finally, expand investments in public health when times are bad. The cliché that an ounce of prevention is worth a pound of cure happens to be true. It is far more expensive to control an epidemic than to prevent one. New York City spent $1 billion in the mid-1990s to control an outbreak of drug-resistant tuberculosis. The drug-resistant strain resulted from the city’s failure to ensure that low-income tuberculosis patients completed their regimen of inexpensive generic medications.

One need not be an economic ideologue — we certainly aren’t — to recognize that the price of austerity can be calculated in human lives. We are not exonerating poor policy decisions of the past or calling for universal debt forgiveness. It’s up to policy makers in America and Europe to figure out the right mix of fiscal and monetary policy. What we have found is that austerity — severe, immediate, indiscriminate cuts to social and health spending — is not only self-defeating, but fatal.

David Stuckler & Sanjay Basu

Why randomization is not enough

17 December, 2014 at 19:24 | Posted in Statistics & Econometrics | Leave a comment

randWith interactive confounders explicitly included, the overall treatment effect β0 + β′zt is not a number but a variable that depends on the confounding effects. Absent observation of the interactive compounding effects, what is estimated is some kind of average treatment effect which is called by Imbens and Angrist (1994) a “Local Average Treatment Effect,” which is a little like the lawyer who explained that when he was a young man he lost many cases he should have won but as he grew older he won many that he should have lost, so that on the average justice was done. In other words, if you act as if the treatment effect is a random variable by substituting βt for β0 + β′zt , the notation inappropriately relieves you of the heavy burden of considering what are the interactive confounders and finding some way to measure them. Less elliptically, absent observation of z, the estimated treatment effect should be transferred only into those settings in which the confounding interactive variables have values close to the mean values in the experiment. If little thought has gone into identifying these possible confounders, it seems probable that little thought will be given to the limited applicability of the results in other settings.

Ed Leamer

Friedman’s Folly

17 December, 2014 at 11:04 | Posted in Economics | 5 Comments

In economic theory, there is no true sense of government’s central role in a nation’s economy and in every aspect of its citizen’s lives. I call this Friedman’s Folly …

Seven-Bad-Ideas-jacketModern economics has not made a positive case for what government must and can do. Government, after all, is society; it is all of us getting together. The economy is not. But prevailing orthodox economics would have us believe, following Friedman at least to a degree, and with only a little exaggeration, that it is …

Economists across the spectrum were influenced by the extremist Friedman, I’d argue, because he always defended himself by being consistent with the beautiful idea of the Invisible Hand. By the time the financial crisis of 2008 hit, Americans did not feel themselves part of a great national enterprise, a democracy of opportunity and social justice. They were busy reinventing a modern materialistic individualism, unaware of and apparently not caring how lacking they were in community. The failure to sense an obligation to each other is the worst consequence of Friedman’s Folly. There have been intelligent critics of his economic ideas, but economists in general are Friedman’s handmaidens.

Nancy Cartwright on the limits of linear causal models

16 December, 2014 at 21:42 | Posted in Theory of Science & Methodology | 1 Comment

 

Towards a radical reformulation of the economics curriculum

16 December, 2014 at 09:45 | Posted in Economics | 2 Comments

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One of the main ideas underlining the book is that “being an economist” in the XXI century requires a radical change in the training of economists and such change requires a global effort. A new economics curriculum is needed in order to improve the understanding of the deep interactions between economics and the political forces and the historical processes of social change. The need for trans-disciplinary and interdisciplinary work is highlighted.

Discussions include the following. Main critiques of current practices on theory, methods and structures. Current gaps in the economics curriculum. What should economics graduates know? The contributors are: Nicola Acocella, Sheila Dow, David Hemenway, Arturo Hermann, Grazia Ietto-Gillies, Maria Alejandra Madi, Lars Pålsson Syll, Constantine Passaris, Paul Ormerod, Jack Reardon, Alessando Roncaglia, Asad Zaman.

Yours truly’s contribution to the collection is on “Economics textbooks – anomalies and transmogrification of truth.”

Buy now: Amazon US $17.10 - Amazon UK £ 12.00 - Amazon.de €19.50 - Amazon.it €18.95

Proper use of math in economics

16 December, 2014 at 08:31 | Posted in Economics | 1 Comment

Balliol Croft, Cambridge
27. ii. 06
My dear Bowley,

I have not been able to lay my hands on any notes as to Mathematico-economics that would be of any use to you: and I have very indistinct memories of what I used to think on the subject. I never read mathematics now: in fact I have forgotten even how to integrate a good many things.

13.1a Alfred MarshallBut I know I had a growing feeling in the later years of my work at the subject that a good mathematical theorem dealing with economic hypotheses was very unlikely to be good economics: and I went more and more on the rules — (1) Use mathematics as a short-hand language, rather than as an engine of inquiry. (2) Keep to them till you have done. (3) Translate into English. (4) Then illustrate by examples that are important in real life. (5) Burn the mathematics. (6) If you can’t succeed in 4, burn 3. This last I did often.

I believe in Newton’s Principia Methods, because they carry so much of the ordinary mind with them. Mathematics used in a Fellowship thesis by a man who is not a mathematician by nature — and I have come across a good deal of that — seems to me an unmixed evil. And I think you should do all you can to prevent people from using Mathematics in cases in which the English language is as short as the Mathematical …

Your emptyhandedly,

Alfred Marshall

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